Allow popups by presseing
Ctrl+D or from main menu "Tools|Allow
Popups".

Trick
:

Create many Headings and Sub
Headings and change their default view Layout according to your choice.
Keep these Headings and Sub Headings in a separate collection in
Shelf. Copy & Paste any of these Headings or Sub Headings in to
your working collection for new link storage purposes. This way you don't have
to change layouts after storing links.